The proximity of (algebraic) geometric programming to linear programming. - Richard James Duffin; Elmor L. Peterson (Math. Program., 1972)

Network models for maximization of heat transfer under weight constraints. - Srinivasamurthy Bhargav; Richard James Duffin (Networks, 1972)

Convex analysis treated by linear programming. - Richard James Duffin (Math. Program., 1973)